X-8534414-TAA-T

Position:

• chrX-8534414-TAA-T

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PVS1_Strong PM2 PP5_Moderate

The NM_000216.4(ANOS1):​c.1887_1888del​(p.Tyr630ProfsTer36) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 22)
• Consequence: ANOS1 NM_000216.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 7.64

Genes affected

ANOS1 (HGNC:6211): (anosmin 1) Mutations in this gene cause the X-linked Kallmann syndrome. The encoded protein is similar in sequence to proteins known to function in neural cell adhesion and axonal migration. In addition, this cell surface protein is N-glycosylated and may have anti-protease activity. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 4 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-8534414-TAA-T is Pathogenic according to our data. Variant chrX-8534414-TAA-T is described in ClinVar as [Pathogenic]. Clinvar id is 429739.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ANOS1	NM_000216.4	c.1887_1888del	p.Tyr630ProfsTer36	frameshift_variant	13/14	ENST00000262648.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ANOS1	ENST00000262648.8	c.1887_1888del	p.Tyr630ProfsTer36	frameshift_variant	13/14	1	NM_000216.4	P1

Frequencies

GnomAD3 genomes Cov.: 22

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome Cov.: 22

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

GeneDx

Sep 03, 2015

The c.1887_1888delTT deletion in the KAL1 gene has been reported previously in association with Kallmann syndrome and idiopathic hypogonadotropic hypogonadism (Miraoui et al., 2013, Ma et al., 2011; Sykiotis et al., 2010). The deletion causes a frameshift starting with codon Tyrosine 630, changes this amino acid to a Proline residue and creates a premature Stop codon at position 36 of the new reading frame, denoted p.Tyr630ProfsX36. This variant is located in the highly conserved Fibronectin type-II domain and is predicted to cause loss of normal protein function through protein truncation. Therefore, we interpret this deletion as a pathogenic variant. -

Computational scores

Source: dbNSFP v4.3

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.040		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: rs1131691560; hg19: chrX-8502455;