chr9-133515589-T-G

Position:

• chr9-133515589-T-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_001080483.3(MYMK):​c.418A>C​(p.Lys140Gln) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: MYMK NM_001080483.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.77

Genes affected

MYMK (HGNC:33778): (myomaker, myoblast fusion factor) Involved in myoblast fusion. Located in plasma membrane. Implicated in Carey-Fineman-Ziter syndrome. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a chain Protein myomaker (size 220) in uniprot entity MYMK_HUMAN there are 10 pathogenic changes around while only 1 benign (91%) in NM_001080483.3
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13371429).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MYMK	NM_001080483.3	c.418A>C	p.Lys140Gln	missense_variant	4/5	ENST00000339996.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MYMK	ENST00000339996.4	c.418A>C	p.Lys140Gln	missense_variant	4/5	2	NM_001080483.3	P1
MYMK	ENST00000413714.1	n.473A>C		non_coding_transcript_exon_variant	4/4	3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 04, 2022

The c.418A>C (p.K140Q) alteration is located in exon 4 (coding exon 4) of the TMEM8C gene. This alteration results from a A to C substitution at nucleotide position 418, causing the lysine (K) at amino acid position 140 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.084
BayesDel_addAF	Benign	-0.18	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	18
DANN	Benign	0.97
DEOGEN2	Benign	0.043	T
Eigen	Benign	-0.19
Eigen_PC	Benign	-0.083
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Benign	0.81	T
M_CAP	Benign	0.044	D
MetaRNN	Benign	0.13	T
MetaSVM	Benign	-0.93	T
MutationTaster	Benign	0.88	N
PrimateAI	Benign	0.34	T
PROVEAN	Benign	-1.2	N
REVEL	Benign	0.072
Sift	Benign	0.034	D
Sift4G	Benign	0.13	T
Polyphen		0.0060	B
Vest4		0.20
MutPred		0.32		Loss of methylation at K140 (P = 0.0067);
MVP		0.20
MPC		0.38
ClinPred		0.79	D
GERP RS		4.5
Varity_R		0.19
gMVP		0.50

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr9-136380711;