PCYT1A p.Arg172Lys

Variant names:

• chr3-196214345-C-T
• rs7642243
• ENST00000441879.5:c.515G>A
• PCYT1A p.Arg172Lys

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000441879.5(PCYT1A):​c.515G>A​(p.Arg172Lys) 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. 11/13 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 31)
• Consequence: PCYT1A ENST00000441879.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.606
• Publications: 20 publications found

Genes affected

PCYT1A (HGNC:8754): (phosphate cytidylyltransferase 1A, choline) This gene belongs to the cytidylyltransferase family and is involved in the regulation of phosphatidylcholine biosynthesis. Mutations in this gene are associated with spondylometaphyseal dysplasia with cone-rod dystrophy. Alternatively spliced transcript variants have been found for this gene. [provided by RefSeq, Aug 2015]

SLC51A (HGNC:29955): (solute carrier family 51 member A) Predicted to enable protein heterodimerization activity; protein homodimerization activity; and transmembrane transporter activity. Involved in bile acid secretion. Located in basolateral plasma membrane. Implicated in progressive familial intrahepatic cholestasis. [provided by Alliance of Genome Resources, Apr 2022]

SLC51A Gene-Disease associations (from GenCC):

• cholestasis, progressive familial intrahepatic, 6

  Inheritance: AR, Unknown Classification: LIMITED Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)

LOC105374304 (HGNC:):

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17990613).

Variant Effect in Transcripts

ACMG analysis was done for transcript: ENST00000441879.5. 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
There are no transcript annotations for this variant.

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PCYT1A	ENST00000441879.5	TSL:3	c.515G>A	p.Arg172Lys	missense	Exon 6 of 6	ENSP00000392397.1	C9J2E1
	SLC51A	ENST00000416660.1	TSL:4	c.-47-78C>T		intron	N/A	ENSP00000405414.1	C9J2I5
	ENSG00000309772	ENST00000843822.1		n.229-434G>A		intron	N/A

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 0

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.56
CADD	Benign	1.2
DANN	Benign	0.96
DEOGEN2	Uncertain	0.53	D
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.00068	N
LIST_S2	Benign	0.16	T
MetaRNN	Benign	0.18	T
MetaSVM	Benign	-0.90	T
PhyloP100		-0.61
PROVEAN	Benign	-0.95	N
REVEL	Benign	0.031
Sift	Benign	0.060	T
Mutation Taster		=100/0	polymorphism

Splicing

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs7642243;

hg19: chr3-195941216;