1-119734718-C-T

Variant names:

• chr1-119734718-C-T
• rs77632964
• NM_006623.4:c.595C>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_006623.4(PHGDH):​c.595C>T​(p.Leu199Phe) 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. 14/22 in silico tools predict a benign 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. L199V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: PHGDH NM_006623.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.90
• Publications: 1 publications found

Genes affected

PHGDH (HGNC:8923): (phosphoglycerate dehydrogenase) This gene encodes the enzyme which is involved in the early steps of L-serine synthesis in animal cells. L-serine is required for D-serine and other amino acid synthesis. The enzyme requires NAD/NADH as a cofactor and forms homotetramers for activity. Mutations in this gene have been found in a family with congenital microcephaly, psychomotor retardation and other symptoms. Multiple alternatively spliced transcript variants have been found, however the full-length nature of most are not known. [provided by RefSeq, Aug 2011]

PHGDH Gene-Disease associations (from GenCC):

• neurometabolic disorder due to serine deficiency

  Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
• PHGDH deficiency

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet
• Neu-Laxova syndrome 1

  Inheritance: AR Classification: MODERATE Submitted by: G2P
• Neu-Laxova syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.38163123).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006623.4. 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
	PHGDH	NM_006623.4	MANE Select	c.595C>T	p.Leu199Phe	missense	Exon 6 of 12	NP_006614.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PHGDH	ENST00000641023.2	MANE Select	c.595C>T	p.Leu199Phe	missense	Exon 6 of 12	ENSP00000493175.1	O43175
	PHGDH	ENST00000369409.9	TSL:1	c.595C>T	p.Leu199Phe	missense	Exon 6 of 12	ENSP00000358417.5	A0A2C9F2M7
	PHGDH	ENST00000641597.1		c.595C>T	p.Leu199Phe	missense	Exon 9 of 15	ENSP00000493382.1	O43175

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.051	T
BayesDel_noAF	Benign	-0.31
CADD	Benign	21
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.69	D
Eigen	Benign	0.032
Eigen_PC	Benign	0.12
FATHMM_MKL	Uncertain	0.85	D
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.036	D
MetaRNN	Benign	0.38	T
MetaSVM	Benign	-0.47	T
MutationAssessor	Benign	0.72	N
PhyloP100		1.9
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-2.3	N
REVEL	Uncertain	0.30
Sift	Benign	0.070	T
Sift4G	Benign	0.40	T
Polyphen		0.65	P
Vest4		0.25
MutPred		0.43		Loss of catalytic residue at L199 (P = 0.1177)
MVP		0.78
MPC		0.48
ClinPred		0.68	D
GERP RS		3.4
Varity_R		0.53
gMVP		0.50
Mutation Taster		=64/36	polymorphism

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: rs77632964; hg19: chr1-120277341; COSMIC: COSV65570953; COSMIC: COSV65570953;