2-61825653-T-C

Variant names:

• chr2-61825653-T-C
• rs541819550
• ENST00000456262.5:n.*2300A>G

Variant summary

Our verdict is Likely benign. The variant received -5 ACMG points: 0P and 5B. BP4_Strong BS1_Supporting

The NM_001201543.2(FAM161A):​c.*802A>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00128 in 428,192 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00045 (1 hom., cov: 32)
  • Exomes 𝑓: 0.0017 (0 hom.)
• Consequence: FAM161A NM_001201543.2 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.0290
• Publications: 0 publications found

Genes affected

FAM161A (HGNC:25808): (FAM161 centrosomal protein A) This gene belongs to the FAM161 family. It is expressed mainly in the retina. Mouse studies suggested that this gene is involved in development of retinal progenitors during embryogenesis, and that its activity is restricted to mature photoreceptors after birth. Mutations in this gene cause autosomal recessive retinitis pigmentosa-28. Alternatively spliced transcript variants have been identified.[provided by RefSeq, Jan 2011]

FAM161A Gene-Disease associations (from GenCC):

• retinitis pigmentosa 28

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P
• retinitis pigmentosa

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -5 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.94).
• BS1: Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000448 (68/151830) while in subpopulation SAS AF = 0.0079 (38/4810). AF 95% confidence interval is 0.00592. There are 1 homozygotes in GnomAd4. There are 42 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
FAM161A	NM_001201543.2	c.*802A>G		3_prime_UTR_variant	Exon 7 of 7	ENST00000404929.6	NP_001188472.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
FAM161A	ENST00000404929.6	c.*802A>G		3_prime_UTR_variant	Exon 7 of 7	1	NM_001201543.2	ENSP00000385158.1

Frequencies

GnomAD3 genomes AF: 0.000442 AC: 67 AN: 151720 Hom.: 1 Cov.: 32

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000131

Gnomad ASJ AF: 0.00577

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00768

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000295

Gnomad OTH AF: 0.00288

GnomAD2 exomes AF: 0.00163 AC: 171 AN: 104822 AF XY: 0.00177

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000439

Gnomad ASJ exome AF: 0.00584

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000242

Gnomad OTH exome AF: 0.000312

GnomAD4 exome AF: 0.00174 AC: 481 AN: 276362 Hom.: 0 Cov.: 0 AF XY: 0.00229 AC XY: 363 AN XY: 158696

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 6550

American (AMR) AF: 0.000393 AC: 8 AN: 20378

Ashkenazi Jewish (ASJ) AF: 0.00644 AC: 63 AN: 9784

East Asian (EAS) AF: 0.00 AC: 0 AN: 9096

South Asian (SAS) AF: 0.00711 AC: 379 AN: 53332

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 11654

Middle Eastern (MID) AF: 0.00203 AC: 2 AN: 986

European-Non Finnish (NFE) AF: 0.0000923 AC: 14 AN: 151722

Other (OTH) AF: 0.00117 AC: 15 AN: 12860

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome AF: 0.000448 AC: 68 AN: 151830 Hom.: 1 Cov.: 32 AF XY: 0.000566 AC XY: 42 AN XY: 74242

African (AFR) AF: 0.00 AC: 0 AN: 41492

American (AMR) AF: 0.000131 AC: 2 AN: 15250

Ashkenazi Jewish (ASJ) AF: 0.00577 AC: 20 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5182

South Asian (SAS) AF: 0.00790 AC: 38 AN: 4810

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10440

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.0000295 AC: 2 AN: 67880

Other (OTH) AF: 0.00285 AC: 6 AN: 2102

Alfa AF: 0.000609 Hom.: 1

Bravo AF: 0.000355

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Retinitis pigmentosa Uncertain:1

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	2.6
DANN	Benign	0.38
PhyloP100		-0.029
Mutation Taster		=100/0	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: rs541819550; hg19: chr2-62052788;