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Mendeliome v1.2479 PCNA Sangavi Sivagnanasundram gene: PCNA was added
gene: PCNA was added to Mendeliome. Sources: ClinGen
Mode of inheritance for gene: PCNA was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: PCNA were set to 24911150, 33426167, 36990216
Phenotypes for gene: PCNA were set to hereditary ataxia MONDO:0100309
Review for gene: PCNA was set to AMBER
Added comment: Classified as Limited by Cerebellar Ataxia GCEP on 09/04/2025 - https://search.clinicalgenome.org/CCID:008778

Two missense variants have been reported across 5 families. Both the missense variants are present in gnomAD (rare enough for AR gene). Method of pathogenicity is still unknown.
Affected individuals reported with ataxia, photosensitivity, telangiectasias, and some degree of intellectual disability.
Sources: ClinGen
Mendeliome v1.2263 TRPM7 Zornitza Stark changed review comment from: Protein expressed in the distal tubule, related to TRPM6. Postulated link with hypoMg with secondary hypoCa. PMID 35561741: two families reported with dominant inheritance. F1: three affected individuals with splicing variant; some supportive functional data. F2: single affected individual, de novo missense variant. PMID 35712613: de novo missense variant in an individual with hypoMg. PMID 39099563: three affected individuals with missense variants, all de novo. Probands had DD, two had seizures.; to: Protein expressed in the distal tubule, related to TRPM6. Postulated link with hypoMg with secondary hypoCa. PMID 35561741: two families reported with dominant inheritance. F1: three affected individuals with splicing variant; some supportive functional data. F2: single affected individual, de novo missense variant. PMID 35712613: de novo missense variant in an individual with hypoMg. PMID 39099563: three affected individuals with missense variants, all de novo. Probands had DD, two had seizures.

Overall, Green for association with HypoMg.

Red for ALS and stillbirth.
Mendeliome v1.2263 TRPM7 Zornitza Stark edited their review of gene: TRPM7: Added comment: Protein expressed in the distal tubule, related to TRPM6. Postulated link with hypoMg with secondary hypoCa. PMID 35561741: two families reported with dominant inheritance. F1: three affected individuals with splicing variant; some supportive functional data. F2: single affected individual, de novo missense variant. PMID 35712613: de novo missense variant in an individual with hypoMg. PMID 39099563: three affected individuals with missense variants, all de novo. Probands had DD, two had seizures.; Changed rating: GREEN; Changed publications: 32503408, 31423533, 35561741, 35712613, 39099563; Changed phenotypes: Familial primary hypomagnesemia, MONDO:0018100, TRPM7-related, {Amyotrophic lateral sclerosis-parkinsonism/dementia complex, susceptibility to}, MIM# 105500, Cardiac arrhythmia, stillbirth
Mendeliome v1.1894 LDB3 Bryony Thompson Added comment: Comment on list classification: Monoallelic DCM association is still Amber
Mendeliome v1.1226 IL36RN Zornitza Stark edited their review of gene: IL36RN: Added comment: Monoallelic disease: Multiple patients with systemic inflammation with monoallelic variants in IL36RN suggesting a gene dosage effect whereby GPP onset is significantly delayed in subjects with monoallelic mutations but still at high risk of systemic inflammation.; Changed publications: 21848462, 21839423, 22903787, 23648549, 25458002; Changed phenotypes: Psoriasis 14, pustular, MIM# 614204, Autoinflammatory syndrome, MONDO:0019751, IL36RN-related; Changed mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal
Mendeliome v1.757 NPPA Chern Lim reviewed gene: NPPA: Rating: AMBER; Mode of pathogenicity: None; Publications: 36303204, 19646991, 23275345; Phenotypes: Atrial fibrillation, familial, 6 (MIM#612201), AD, Atrial standstill 2 (MIM#615745), AR; Mode of inheritance: BOTH monoallelic and biallelic, autosomal or pseudoautosomal; Current diagnostic: yes
Mendeliome v1.601 TRPC5 Hazel Phillimore gene: TRPC5 was added
gene: TRPC5 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: TRPC5 was set to X-LINKED: hemizygous mutation in males, biallelic mutations in females
Publications for gene: TRPC5 were set to PMID: 36323681; 24817631; 23033978; 33504798; 28191890
Phenotypes for gene: TRPC5 were set to Intellectual disability; autistic spectrum disorder
Review for gene: TRPC5 was set to AMBER
Added comment: PMID: 36323681; Leitão E. et al. (2022) Nat Commun.13(1):6570:
Missense variant NM_012471.2:c.523C>T, p.(Arg175Cys in three brothers with intellectual disability (ID) and autistic spectrum disorder (ASD), inherited from an asymptomatic mother and absent in the maternal grandparents.
Whole cell patch clamp studies of HEK293 created by site-directed mutagenesis showed increased current of this calcium channel (constitutively opened).
(This variant is absent in gnomAD v2.1.1).

Also, the nonsense variant, c.965G> A, p.(Trp322*) was found in a high functioning ASD male (maternally inherited), NMD-predicted.

Other papers and TRPC5 variants that were cited to associate this gene with X-linked ID and/or ASD include:
PMID: 24817631; Mignon-Ravix, C. et al. (2014) Am. J.Med. Genet. A 164A: 1991–1997: A hemizygous 47-kb deletion in Xq23 including exon 1 of the TRPC5 gene. He had macrocephaly, delayed psychomotor development, speech delay, behavioural problems, and autistic features. Maternally inherited, and a family history compatible with X-linked inheritance (i.e., maternal great uncle was also affected, although not tested).

In addition, PMID: 36323681; Leitão E. et al. (2022) cites papers with the variants p.(Pro667Thr), p.(Arg71Gln) and p.(Trp225*).
NB. p.(Pro667Thr) is absent in gnomAD (v2.1.1), p.(Arg71Gln) is also absent (the alternative variant p.(Arg71Trp) is present once as heterozygous only). p.(Trp225*) is absent, and it should be noted that PTCs / LoF variants are very rare (pLI = 1).

However, looking further into the three references, the evidence is not as clear or as accurate as was stated.

The missense variant c.1999C>A, p.(Pro667Thr), was stated as de novo, but was actually maternally inherited but was still considered a candidate for severe intellectual disability (shown in the Appendix, Patient 93, with severe speech delay, autism spectrum disorder and Gilles de la Tourette). This patient also has a de novo MTF1 variant. Reference: PMID: 23033978; de Ligt, J. et al. (2012) N. Engl. J. Med. 367: 1921–1929).

Missense variant (de novo): c.212G>A, p.(Arg71Gln), was found as part of the Deciphering Developmental Disorders (DDD) study and is shown in individual 164 in Supplementary Table 2 of PMID: 33504798; Martin, HC. et al. (2021) Nat. Commun.12: 627. Also displayed in DECIPHER (DDD research variant) with several phenotype traits, but ID and ASD are not specifically mentioned.

Nonsense variant: c.674G>A. p.(Trp225*) was stated as de novo but was inherited (reference PMID: 28191890; Kosmicki, JA. et al. (2017) Nat. Genet. 49: 504–510. Supplement Table 7). This was a study of severe intellectual delay, developmental delay / autism. (NB. The de novo p.(Arg71Gln) variant from the DDD study is also listed (subject DDD 342 in Supplement 4 / Table 2).
Sources: Literature
Mendeliome v0.7974 ZBTB42 Zornitza Stark gene: ZBTB42 was added
gene: ZBTB42 was added to Mendeliome. Sources: Expert Review
Mode of inheritance for gene: ZBTB42 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: ZBTB42 were set to 25055871
Phenotypes for gene: ZBTB42 were set to Lethal congenital contracture syndrome 6, MIM# 616248
Review for gene: ZBTB42 was set to AMBER
Added comment: Homozygous missense variant reported in a family with three stillbirths and a phenotype consistent with LCCS. Supportive zebrafish model.
Sources: Expert Review
Mendeliome v0.6980 STIL Zornitza Stark Marked gene: STIL as ready
Mendeliome v0.6980 STIL Zornitza Stark Gene: stil has been classified as Green List (High Evidence).
Mendeliome v0.6980 STIL Zornitza Stark Phenotypes for gene: STIL were changed from to Microcephaly 7, primary, autosomal recessive, MIM# 612703; MONDO:0012989
Mendeliome v0.6979 STIL Zornitza Stark Publications for gene: STIL were set to
Mendeliome v0.6978 STIL Zornitza Stark Mode of inheritance for gene: STIL was changed from Unknown to BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.6977 STIL Zornitza Stark reviewed gene: STIL: Rating: GREEN; Mode of pathogenicity: None; Publications: 19215732, 22989186, 25218063, 33132204, 32677750, 29230157; Phenotypes: Microcephaly 7, primary, autosomal recessive, MIM# 612703, MONDO:0012989; Mode of inheritance: BIALLELIC, autosomal or pseudoautosomal
Mendeliome v0.6164 MYADML2 Paul De Fazio gene: MYADML2 was added
gene: MYADML2 was added to Mendeliome. Sources: Literature
Mode of inheritance for gene: MYADML2 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: MYADML2 were set to 32778762
Phenotypes for gene: MYADML2 were set to Cranial asymmetry, reduced bone maturation, multiple dislocations, lumbar lordosis, and prominent clavicles
Review for gene: MYADML2 was set to RED
gene: MYADML2 was marked as current diagnostic
Added comment: 5 sibs from a consanguineous family identified to have biallelic deletion encompassing part of the PYCR1 gene and the coding region of the MYADML2 gene.

According to the authors: "All five affected sibs had the most common features of ARCL (autosomal recessive cutis laxa) but not many of the less common ones. We attributed the anomalies not typical for ARCL to MYADML2 deficit, because no other genetic defect possibly a candidate to underlie the skeletal phenotype was found."

Phenotype may still be explained by the PYCR1 deletion alone.
Sources: Literature
Mendeliome v0.4101 TRPM7 Zornitza Stark Phenotypes for gene: TRPM7 were changed from {Amyotrophic lateral sclerosis-parkinsonism/dementia complex, susceptibility to}, MIM# 105500 to {Amyotrophic lateral sclerosis-parkinsonism/dementia complex, susceptibility to}, MIM# 105500; Cardiac arrhythmia, stillbirth
Mendeliome v0.4097 TRPM7 Zornitza Stark edited their review of gene: TRPM7: Added comment: Ion channel expressed in the nervous and cardiac systems. The variant associated with ALS/dementia in the Guam population, p.Thr1482Ile is present in >23,000 hets in gnomad, which is out of keeping for a rare Mendelian disorder. Note recent publication associating missense variants with cardiac arrhythmia and stillbirth, with some functional data provided to substantiate effect of variant on protein function but not necessarily establish gene-disease association.; Changed rating: AMBER; Changed publications: 32503408, 31423533; Changed phenotypes: {Amyotrophic lateral sclerosis-parkinsonism/dementia complex, susceptibility to}, MIM# 105500, Cardiac arrhythmia, stillbirth; Changed mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, NOT imprinted
Mendeliome v0.4091 TRPM7 Eleanor Williams commented on gene: TRPM7: PMID: 31423533 - Cartwright et al 2020 - functional studies on four heterozygous nonsynonymous variants that were observed in TRPM7 in four individual cases of unexplained still birth which were screened for variants in 35 candidate genes in PMID: 29874177 (Munroe et al 2018). TRPM7 is a ubiquitously expressed ion channel known to regulate cardiac development and repolarization in mice. They found two variants in TRPM7, p.G179V and p.T860M, reduce ion channel current expression, which in the case of p.T860M is likely due to rapid degradation mediated by the proteasome. In addition, the p.R494Q TRPM7 variant significantly increases TRPM7 ion channel current, in a cell-type specific manner. They believe that TRPM7 may play a key role in ensuring correct cardiac development of the fetus.
Mendeliome v0.4091 TRPM7 Eleanor Williams reviewed gene: TRPM7: Rating: AMBER; Mode of pathogenicity: None; Publications: 31423533, 29874177; Phenotypes: still birth, cardiac development; Mode of inheritance: MONOALLELIC, autosomal or pseudoautosomal, imprinted status unknown
Mendeliome v0.2621 POLR3GL Zornitza Stark Added comment: Comment when marking as ready: Three cases altogether but the phenotypes are very different -- may still represent a spectrum with the more severe phenotypes resulting from truncating variants but further cases needed.
Mendeliome v0.2611 TSPEAR Chern Lim changed review comment from: Still a rare disease gene for ectodermal dysplasia but has been reported in at least 3 unrelated families. Functional study supported LoF. (PMIDs: 27736875, 30046887); to: Still a rare disease gene for ectodermal dysplasia but has been reported in at least 3 unrelated families in 2 papers. Functional study supported LoF. (PMIDs: 27736875, 30046887)
Mendeliome v0.1777 TIMMDC1 Zornitza Stark gene: TIMMDC1 was added
gene: TIMMDC1 was added to Mendeliome. Sources: NHS GMS
Mode of inheritance for gene: TIMMDC1 was set to BIALLELIC, autosomal or pseudoautosomal
Publications for gene: TIMMDC1 were set to 28604674; 30981218
Phenotypes for gene: TIMMDC1 were set to Mitochondrial complex I deficiency, nuclear type 31 MIM#618251
Review for gene: TIMMDC1 was set to AMBER
Added comment: A deep intronic variant (c.597-1340A>G, only detectable by WGS) that causes a splicing aberration was identified in a homozygous state in 3 unrelated cases from different ethnic backgrounds. A patient with Leigh-like syndrome had a homozygous stopgain variant in PDHX and a homozygous stopgain variant in TIMMDC1 (p.Arg225*). The TIMMDC1 mutant protein could still rescue complex I assembly in TIMMDC1 knockout cells and the patient’s clinical phenotype was not clearly distinct from that of other patients with the same PDHX defect.
Sources: NHS GMS
Mendeliome v0.1271 HDAC4 Zornitza Stark changed review comment from: Comment when marking as ready: Contradictory evidence: deletions linked to brachydactyly-MR but note some individuals reported without MR. Only reports of intragenic variants (still structural rather than SNVs).; to: Comment when marking as ready: Contradictory evidence: deletions linked to brachydactyly-MR but note some individuals reported without MR. Only two reports of intragenic variants (still structural rather than SNVs).
Mendeliome v0.1271 HDAC4 Zornitza Stark Added comment: Comment when marking as ready: Contradictory evidence: deletions linked to brachydactyly-MR but note some individuals reported without MR. Only reports of intragenic variants (still structural rather than SNVs).
Mendeliome v0.0 STIL Zornitza Stark gene: STIL was added
gene: STIL was added to Mendeliome_VCGS. Sources: Expert Review Green,Victorian Clinical Genetics Services
Mode of inheritance for gene: STIL was set to Unknown