NM_000273.3:c.1203T>C

Variant names:

• chrX-9725758-A-G
• rs780522481
• NM_000273.3:c.1203T>C

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_000273.3(GPR143):​c.1203T>C​(p.His401His) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000092 in 1,087,245 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts 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: 21)
  • Exomes 𝑓: 9.2e-7 (0 hom. 1 hem.)
• Consequence: GPR143 NM_000273.3 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.294
• Publications: 0 publications found

Genes affected

GPR143 (HGNC:20145): (G protein-coupled receptor 143) This gene encodes a protein that binds to heterotrimeric G proteins and is targeted to melanosomes in pigment cells. This protein is thought to be involved in intracellular signal transduction mechanisms. Mutations in this gene cause ocular albinism type 1, also referred to as Nettleship-Falls type ocular albinism, a severe visual disorder. A related pseudogene has been identified on chromosome Y. [provided by RefSeq, Dec 2009]

TBL1X (HGNC:11585): (transducin beta like 1 X-linked) The protein encoded by this gene has sequence similarity with members of the WD40 repeat-containing protein family. The WD40 group is a large family of proteins, which appear to have a regulatory function. It is believed that the WD40 repeats mediate protein-protein interactions and members of the family are involved in signal transduction, RNA processing, gene regulation, vesicular trafficking, cytoskeletal assembly and may play a role in the control of cytotypic differentiation. This encoded protein is found as a subunit in corepressor SMRT (silencing mediator for retinoid and thyroid receptors) complex along with histone deacetylase 3 protein. This gene is located adjacent to the ocular albinism gene and it is thought to be involved in the pathogenesis of the ocular albinism with late-onset sensorineural deafness phenotype. Four transcript variants encoding two different isoforms have been found for this gene. This gene is highly similar to the Y chromosome TBL1Y gene. [provided by RefSeq, Nov 2008]

TBL1X Gene-Disease associations (from GenCC):

• hypothyroidism, congenital, nongoitrous, 8

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

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BP7: Synonymous conserved (PhyloP=0.294 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000273.3. 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
	GPR143	NM_000273.3	MANE Select	c.1203T>C	p.His401His	synonymous	Exon 9 of 9	NP_000264.2	P51810
	GPR143	NM_001440781.1		c.*178T>C		3_prime_UTR	Exon 9 of 9	NP_001427710.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GPR143	ENST00000467482.6	TSL:1 MANE Select	c.1203T>C	p.His401His	synonymous	Exon 9 of 9	ENSP00000417161.1	P51810
	GPR143	ENST00000929114.1		c.1287T>C	p.His429His	synonymous	Exon 10 of 10	ENSP00000599173.1
	GPR143	ENST00000929113.1		c.1185T>C	p.His395His	synonymous	Exon 9 of 9	ENSP00000599172.1

Frequencies

GnomAD3 genomes Cov.: 21

GnomAD4 exome AF: 9.20e-7 AC: 1 AN: 1087245 Hom.: 0 Cov.: 27 AF XY: 0.00000283 AC XY: 1 AN XY: 353463

African (AFR) AF: 0.00 AC: 0 AN: 26177

American (AMR) AF: 0.00 AC: 0 AN: 35179

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19316

East Asian (EAS) AF: 0.00 AC: 0 AN: 30165

South Asian (SAS) AF: 0.00 AC: 0 AN: 53721

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40506

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4113

European-Non Finnish (NFE) AF: 0.00000120 AC: 1 AN: 832352

Other (OTH) AF: 0.00 AC: 0 AN: 45716

GnomAD4 genome Cov.: 21

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	3.0
DANN	Benign	0.38
PhyloP100		0.29

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: rs780522481; hg19: chrX-9693798;