4-186162870-A-G

Position:

• chr4-186162870-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001395294.1(FAM149A):​c.1628A>G​(p.Tyr543Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. Y543D) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 29)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: FAM149A NM_001395294.1 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.728

Genes affected

FAM149A (HGNC:24527): (family with sequence similarity 149 member A)

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13458768).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
FAM149A	NM_001395294.1	c.1628A>G	p.Tyr543Cys	missense_variant	9/14	ENST00000706927.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
FAM149A	ENST00000706927.1	c.1628A>G	p.Tyr543Cys	missense_variant	9/14		NM_001395294.1	A2

Frequencies

GnomAD3 genomes Cov.: 29

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1294180 Hom.: 0 Cov.: 28 AF XY: 0.00 AC XY: 0 AN XY: 647376

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: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 29

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 24, 2023

The c.755A>G (p.Y252C) alteration is located in exon 9 (coding exon 6) of the FAM149A gene. This alteration results from a A to G substitution at nucleotide position 755, causing the tyrosine (Y) at amino acid position 252 to be replaced by a cysteine (C). 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	0.060
BayesDel_addAF	Benign	-0.22	T
BayesDel_noAF	Benign	-0.55
CADD	Benign	5.1
DANN	Benign	0.93
Eigen	Benign	-0.63
Eigen_PC	Benign	-0.66
FATHMM_MKL	Benign	0.072	N
M_CAP	Benign	0.0043	T
MetaRNN	Benign	0.13	T;T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	N;N;N;N;N;N
PrimateAI	Benign	0.33	T
PROVEAN	Uncertain	-2.4	N;N;N;N;N;N
REVEL	Benign	0.019
Sift	Benign	0.21	T;T;T;T;T;T
Sift4G	Benign	0.22	T;T;T;T;T;T
Polyphen		0.047	.;B;.;.;.;.
Vest4		0.33
MVP		0.30
MPC		0.12
ClinPred		0.22	T
GERP RS		1.1
Varity_R		0.082
gMVP		0.066

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs1488121665; hg19: chr4-187084024;