chr16-81084501-T-C

Position:

• chr16-81084501-T-C

Variant summary

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

The NM_004483.5(GCSH):​c.386A>G​(p.Glu129Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 33)
• Consequence: GCSH NM_004483.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 6.05

Genes affected

GCSH (HGNC:4208): (glycine cleavage system protein H) Degradation of glycine is brought about by the glycine cleavage system, which is composed of four mitochondrial protein components: P protein (a pyridoxal phosphate-dependent glycine decarboxylase), H protein (a lipoic acid-containing protein), T protein (a tetrahydrofolate-requiring enzyme), and L protein (a lipoamide dehydrogenase). The protein encoded by this gene is the H protein, which transfers the methylamine group of glycine from the P protein to the T protein. Defects in this gene are a cause of nonketotic hyperglycinemia (NKH). Two transcript variants, one protein-coding and the other probably not protein-coding,have been found for this gene. Also, several transcribed and non-transcribed pseudogenes of this gene exist throughout the genome.[provided by RefSeq, Jan 2010]

ENSG00000284512 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GCSH	NM_004483.5	c.386A>G	p.Glu129Gly	missense_variant	4/5	ENST00000315467.9	NP_004474.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GCSH	ENST00000315467.9	c.386A>G	p.Glu129Gly	missense_variant	4/5	1	NM_004483.5	ENSP00000319531.3
ENSG00000284512	ENST00000640345.1	c.386A>G	p.Glu129Gly	missense_variant	4/6	5		ENSP00000492798.1
ENSG00000260643	ENST00000564536.2	c.386A>G	p.Glu129Gly	missense_variant	4/6	5		ENSP00000491651.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000756

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

Dec 03, 2024

The c.386A>G (p.E129G) alteration is located in exon 4 (coding exon 4) of the GCSH gene. This alteration results from a A to G substitution at nucleotide position 386, causing the glutamic acid (E) at amino acid position 129 to be replaced by a glycine (G). 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	0.14
BayesDel_addAF	Benign	-0.059	T
BayesDel_noAF	Benign	-0.32
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.31	.;.;.;T;.;.
Eigen	Uncertain	0.36
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.88	D;D;D;D;D;D
M_CAP	Benign	0.0097	T
MetaRNN	Uncertain	0.47	T;T;T;T;T;T
MetaSVM	Benign	-0.91	T
MutationAssessor	Benign	1.0	.;.;.;L;.;.
PrimateAI	Benign	0.42	T
PROVEAN	Pathogenic	-4.9	.;.;.;D;.;.
REVEL	Benign	0.16
Sift	Uncertain	0.010	.;.;.;D;.;.
Sift4G	Benign	0.067	.;.;.;T;.;.
Polyphen		0.77	.;.;.;P;.;.
Vest4		0.39
MutPred		0.48		Loss of stability (P = 0.0302);.;Loss of stability (P = 0.0302);Loss of stability (P = 0.0302);Loss of stability (P = 0.0302);.;
MVP		0.69
MPC		0.52
ClinPred		0.99	D
GERP RS		5.1
Varity_R		0.69
gMVP		0.48

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs1972232261; hg19: chr16-81118106;