8-74360173-T-C

Position:

• chr8-74360173-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PM5

The NM_018972.4(GDAP1):​c.347T>C​(p.Met116Thr) variant causes a missense change. The variant allele was found at a frequency of 0.00000274 in 1,461,368 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. M116R) has been classified as Pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: GDAP1 NM_018972.4 missense
• Clinical Significance: Uncertain significance no assertion criteria provided U:2
• Conservation: PhyloP100: 3.60

Genes affected

GDAP1 (HGNC:15968): (ganglioside induced differentiation associated protein 1) This gene encodes a member of the ganglioside-induced differentiation-associated protein family, which may play a role in a signal transduction pathway during neuronal development. Mutations in this gene have been associated with various forms of Charcot-Marie-Tooth Disease and neuropathy. Two transcript variants encoding different isoforms and a noncoding variant have been identified for this gene. [provided by RefSeq, Feb 2012]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 7 uncertain in NM_018972.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr8-74360173-T-G is described in ClinVar as [Pathogenic]. Clinvar id is 38411.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GDAP1	NM_018972.4	c.347T>C	p.Met116Thr	missense_variant	3/6	ENST00000220822.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GDAP1	ENST00000220822.12	c.347T>C	p.Met116Thr	missense_variant	3/6	1	NM_018972.4	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461368 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727046

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: no assertion criteria provided

Submissions by phenotype

Charcot-Marie-Tooth disease Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Inherited Neuropathy Consortium

-

- -

Charcot-Marie-Tooth disease type 4A Uncertain:1

Uncertain significance, no assertion criteria provided

literature only

Inherited Neuropathy Consortium Ii, University Of Miami

Jan 06, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.13
CADD	Benign	20
DANN	Benign	0.86
DEOGEN2	Benign	0.080	T;.
Eigen	Benign	-0.22
Eigen_PC	Benign	0.034
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.77	T;T
M_CAP	Benign	0.070	D
MetaRNN	Uncertain	0.71	D;D
MetaSVM	Uncertain	0.63	D
MutationAssessor	Benign	0.0	N;.
MutationTaster	Benign	0.95	D;D
PrimateAI	Uncertain	0.66	T
PROVEAN	Benign	0.080	N;N
REVEL	Uncertain	0.50
Sift	Benign	0.57	T;T
Sift4G	Benign	0.19	T;T
Polyphen		0.0	B;.
Vest4		0.82
MutPred		0.83		Loss of catalytic residue at M116 (P = 0.0018);.;
MVP		0.94
MPC		0.50
ClinPred		0.57	D
GERP RS		5.5
Varity_R		0.21
gMVP		0.67

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs281865060; hg19: chr8-75272408;