chrX-85278646-C-A

Position:

• chrX-85278646-C-A

Variant summary

Our verdict is Benign. Variant got -10 ACMG points: 0P and 10B. BP4_Strong BP6_Moderate BS2

The NM_024921.4(POF1B):​c.*775G>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.009 in 110,759 control chromosomes in the GnomAD database, including 10 homozygotes. There are 255 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0090 (10 hom., 254 hem., cov: 22)
  • Exomes 𝑓: 0.0035 (0 hom. 1 hem.)
• Consequence: POF1B NM_024921.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: -0.964

Genes affected

POF1B (HGNC:13711): (POF1B actin binding protein) Premature ovarian failure (POF) is characterized by primary or secondary amenorrhea in women less than 40 years old. Two POF susceptibility regions called "POF1" and "POF2" have been identified by breakpoint mapping of X-autosome translocations. POF1 extends from Xq21-qter while POF2 extends from Xq13.3 to Xq21.1. This gene, POF1B, resides in the POF2 region. This gene is expressed at trace levels in mouse prenatal ovary and is barely detectable or absent from adult ovary, in human and in the mouse respectively. This gene's expression is restricted to epithelia with its highest expression in the epidermis, and oro-pharyngeal and gastro-intestinal tracts. The protein encoded by this gene binds non-muscle actin filaments. The role this gene may play in the etiology of premature ovarian failure remains to be determined. [provided by RefSeq, Jan 2010]

ACMG classification

Verdict is Benign. Variant got -10 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.87).
• BP6: Variant X-85278646-C-A is Benign according to our data. Variant chrX-85278646-C-A is described in ClinVar as [Benign]. Clinvar id is 368769.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS2: High Homozygotes in GnomAd4 at 10 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
POF1B	NM_024921.4	c.*775G>T		3_prime_UTR_variant	17/17	ENST00000262753.9	NP_079197.3
POF1B	XM_005262203.5	c.*775G>T		3_prime_UTR_variant	17/17		XP_005262260.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
POF1B	ENST00000262753	c.*775G>T		3_prime_UTR_variant	17/17	1	NM_024921.4	ENSP00000262753.4

Frequencies

GnomAD3 genomes AF: 0.00906 AC: 1000 AN: 110430 Hom.: 11 Cov.: 22 AF XY: 0.00776 AC XY: 256 AN XY: 32988

Gnomad AFR AF: 0.00131

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00650

Gnomad ASJ AF: 0.00727

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00302

Gnomad FIN AF: 0.00287

Gnomad MID AF: 0.0513

Gnomad NFE AF: 0.0157

Gnomad OTH AF: 0.0107

GnomAD4 exome AF: 0.00355 AC: 1 AN: 282 Hom.: 0 Cov.: 0 AF XY: 0.00909 AC XY: 1 AN XY: 110

Gnomad4 FIN exome AF: 0.00360

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00902 AC: 996 AN: 110477 Hom.: 10 Cov.: 22 AF XY: 0.00769 AC XY: 254 AN XY: 33045

Gnomad4 AFR AF: 0.00131

Gnomad4 AMR AF: 0.00650

Gnomad4 ASJ AF: 0.00727

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00265

Gnomad4 FIN AF: 0.00287

Gnomad4 NFE AF: 0.0156

Gnomad4 OTH AF: 0.0105

Alfa AF: 0.0110 Hom.: 63

Bravo AF: 0.00837

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Premature ovarian failure 2B Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

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 and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.87
CADD	Benign	0.29
DANN	Benign	0.35

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

Publications

LitVar

Other links and lift over

dbSNP: rs147030302; hg19: chrX-84533652;