Is CFTR p.His620= (c.1860T>C) pathogenic?

CFTR p.His620= (c.1860T>C) is classified Likely benign in CFTR (ClinVar, Single submitter, 1 submitter; last evaluated 2021-04-18). Absent from gnomAD v4.1; Associated with cystic fibrosis.

What condition is associated with CFTR p.His620= (c.1860T>C)?

CFTR p.His620= (c.1860T>C) is associated with cystic fibrosis (ClinVar).

How common is CFTR p.His620= (c.1860T>C) in the general population?

CFTR p.His620= (c.1860T>C) is absent from gnomAD v4.1 (gnomAD).

How is Cystic fibrosis inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

CFTR p.His620=

c.1860T>C · rs397508315 · VCV1537108

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

cystic fibrosis

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · T>G here scores Δ0.73 · evaluated, not missing
Constraint at this position
Conservation	phyloP 0.44	GERP 0.51, phastCons 1
Overall
CADD	6.025	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CFTR
Protein: p.His620=
Coding: c.1860T>C
MANE Select: NM_000492
dbSNP: rs397508315
Type: single nucleotide variant
Location: chr7:117592027 (GRCh38)
Gene constraint: LOEUF 1.152 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 75.96 · 60 PDB
Residue 620: a UniProt-annotated variant site (in cf); a UniProt-annotated variant site (in cf; impaired maturation of glycan chains); a UniProt-annotated variant site (in cf; strong decrease in bicarbonate transport; increase in chloride channel activity in vitro; no effect on glycan maturation); the abc transporter 1 domain; a β-strand

Full CFTR gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

cystic fibrosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Cystic fibrosis (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-5 / 10 000 (Europe)

Similar variants

CFTR p.His620Pro Likely pathogenic ★ same residue
CFTR p.His620Gln Conflicting classifications of pathogenicity ★ ⚠ same residue
CFTR p.His620Leu Uncertain significance ★ ⚠ same residue
CFTR p.His620Tyr Uncertain significance ★ ⚠ same residue
CFTR c.1585-1G>A Pathogenic ★★★★ same condition
CFTR c.1766+1G>A Pathogenic ★★★★ same condition
CFTR c.2657+5G>A Pathogenic ★★★★ same condition
CFTR c.2988+1G>A Pathogenic ★★★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/cftr-p-his620 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown