NM_004483.5:c.413G>T

Variant names:

• chr16-81084474-C-A
• rs540817676
• NM_004483.5:c.413G>T

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_004483.5(GCSH):​c.413G>T​(p.Cys138Phe) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000686 in 1,457,570 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C138Y) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: GCSH NM_004483.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 7.68
• Publications: 0 publications found

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]

GCSH Gene-Disease associations (from GenCC):

• glycine encephalopathy

  Inheritance: AR Classification: STRONG, LIMITED Submitted by: ClinGen, Ambry Genetics
• multiple mitochondrial dysfunctions syndrome 7

  Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• infantile glycine encephalopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• neonatal glycine encephalopathy

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• atypical glycine encephalopathy

  Inheritance: Unknown Classification: SUPPORTIVE Submitted by: Orphanet

ENSG00000284512 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.917

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004483.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCSH	NM_004483.5	MANE Select	c.413G>T	p.Cys138Phe	missense	Exon 4 of 5	NP_004474.2
	GCSH	NR_033249.2		n.466G>T		non_coding_transcript_exon	Exon 3 of 4

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GCSH	ENST00000315467.9	TSL:1 MANE Select	c.413G>T	p.Cys138Phe	missense	Exon 4 of 5	ENSP00000319531.3	P23434
	ENSG00000284512	ENST00000640345.1	TSL:5	c.413G>T	p.Cys138Phe	missense	Exon 4 of 6	ENSP00000492798.1	A0A1W2PS29
	ENSG00000260643	ENST00000564536.2	TSL:5	c.413G>T	p.Cys138Phe	missense	Exon 4 of 6	ENSP00000491651.1	A0A1W2PPQ1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.86e-7 AC: 1 AN: 1457570 Hom.: 0 Cov.: 29 AF XY: 0.00 AC XY: 0 AN XY: 725534

African (AFR) AF: 0.00 AC: 0 AN: 33374

American (AMR) AF: 0.00 AC: 0 AN: 44704

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26102

East Asian (EAS) AF: 0.00 AC: 0 AN: 39636

South Asian (SAS) AF: 0.00 AC: 0 AN: 86182

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53416

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5754

European-Non Finnish (NFE) AF: 9.02e-7 AC: 1 AN: 1108152

Other (OTH) AF: 0.00 AC: 0 AN: 60250

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.96
BayesDel_addAF	Pathogenic	0.25	D
BayesDel_noAF	Uncertain	0.12
CADD	Pathogenic	26
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.44	T
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.81
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.86	D
M_CAP	Benign	0.029	D
MetaRNN	Pathogenic	0.92	D
MetaSVM	Uncertain	-0.28	T
MutationAssessor	Uncertain	2.4	M
PhyloP100		7.7
PrimateAI	Uncertain	0.73	T
PROVEAN	Pathogenic	-9.3	D
REVEL	Uncertain	0.49
Sift	Uncertain	0.012	D
Sift4G	Uncertain	0.018	D
Polyphen		0.99	D
Vest4		0.91
MutPred		0.78		Gain of ubiquitination at K136 (P = 0.0913)
MVP		0.71
MPC		1.5
ClinPred		1.0	D
GERP RS		5.0
Varity_R		0.99
gMVP		0.55

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

Other links and lift over

dbSNP: rs540817676; hg19: chr16-81118079;